Improvement in piano-locks



` JOHN MURPHnor" Bost @met @titte INDALE, AssleNoR To veinen J. FAXON, TON, MASSACHUSETTS,

or Bos- Letters Patent No. 107,947, dated October 4, 18,70.f

IMPROVEMENT IN PlAO-LOCKS.

The Schedule` referred to in these Letters Patuent and making pari' of the same ball persons te whom these presents may come:`

Beit known that VI, J ons MURPHY, of ltoslindale, of the county of Norfolk and State of Massachusetts, have invented -a newiand useful or improved Piano- Lock; `and do herebysd'eclare the same to be fully described infthe following specicatiolraiid represented in the accompanying drawing, ot' which` Figure 1 is a view of it as it appearswithout its cap-plate, a side view o f which is shown in` Figure 2. Figure 3 is a transverse section of the lock, such section being-'taken` through the key-hole of' the bolt aetuatoror'cam. i i

`In iig. 1 of such drawingA and B exhibit the two bolts, which turn on separate pivots. a b, arranged to project from the lock-plate E.`

9 `'lhe bolt B is provided with atooth, c, to engage with or enter a notch, d, made in the holt A.. Furthermore, the bolt B has a curved arm, e, e`\" tendedlfrom it in manner as shown.

The two bolts,-i`ormed as represented in iig. 1, play Ifrom the positions'denoted therein,(in which they are shown as drawn withinthe lockease,) into `those represented in Figure 4,;in which `they are exhibited as projecting beyond the case. v

i -A cam, .0, formed and arranged with the bolts in manner as seen in figs. 1` and 4, and pivoted to the plate E and the cap-plate F, `constitutes the actuator of the -bolt B', there being `used with such cani a spring,'.D, to retain it in either of its `extreme positions, the spring, under such circumstances, entering intojone of two recesses,f"g, made in the flanks ofthe heel of thecam,

The pivots ofthe cam `are shown ath h, one of them `being provided witha suitable cavity or cavities, x,

for the `reception of the `head 'i of `a key, H, formed` `as representedin front view in Figure 5 and in'edge view in Figure (i.

i By inserting thekey in the key-hole of the cam C, and turning it seas to `partially revolve such cam, the

' bolts A B'inay he actuated.` i v I' am fully aware of the piano-locks shown and describedin the United States patents Nos. 68,496 and 68,497, granted September 3, 1867, to E.L. Gaylord,

and make `no claim to either, or any part thereof, a

horizontally or vertically-moving slide being employed in such locks to actuate the bolts.

In my lock I make use of no such slide, but one bolt operates the other, and is actuated by a rotary `cam, provided with a retaining spring, the whole being as described and represented;

I am also aware of ther locks constituting the subjects of thc'United States patents Nos. 49,100 and 21,543, the former being granted to Gaylord and the latter to Ackerman.

`There are wide and important dilierences between my lock and these last referred to, for in Gaylords lock the two bolts operate on one common pivot, and each, separate from the other, is operated by the tumbler; but in my lock the bolts Aturn on separate pivots and interlock, one serving to operate the other when the first is pnt in operation by the tumbler or cam C.

Furthernmre, the construction ot the parts of my lock is such as, when it 'is' locked, to prevent it from heilig unlocked by a knife or instrument pressed lat. erall y against that part of either bolt which extendsH out ofthe lock-ease, the position of the cam O and its pivot then being such, with reference tothe holt B, aste cause the cam to act as a stop to the` bolts, which cannot be retracted, except by revolving the cam.

l1n the lock of Ackerman there is but one bolt, which is pivoted to a fall or arm, which is operated by a lever or cam, when actuated by a key, all being not only different in construction, but in operation, relatively to the parts of mylock.

I, therefore, claimf lhejnterlockng bolts A B, constructed andarranged onseparate pivots, a b, as described, and com- Witnesses:V It. H.v EDDY,A

J. R. SNOW. 

